if __name__ == '__main__':

    # 定义苹果的单价
    price = 8.5;

    # 挑选苹果
    weight = 7.5;
    # 计算付款金额
    money = price * weight
    # 只要买苹果就返回5块钱
    money = money - 5;
    print(money);



